Separation and recovery of perfluorocompound gases

Separation and recovery of perfluorocompound gases

Inventors: E. Canivenc, Publication D. Horba date: 6 November withdrawing substantially Electrolyzer pressure, Arrignee: Chlorine Engineers ...

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Inventors:

E. Canivenc,

Publication

D. Horba

date: 6 November

withdrawing substantially

Electrolyzer

pressure,

Arrignee: Chlorine

Engineers

Japan,

Ltd,

Corp

and Tosoh Corp, Japan This

invention

exchange

membrane

electrodes

at

exchange in

a dot-like

electrode

the ion exchange

via

and spacers

an

equal

of

between

and surface

of at

at a pressure

to

a concentrated

essentially

the

which

the membrane,

gas mixture

comprising

stream,

essentially

Publicarion date: 6 November

side of

a depleted

(at lea.&) one

Details

of

a sample

Inventors: Y.-E. Li, J.E. Paganessi,

D. Vassallo,

G.K. Fleming

two

Publication date: 6 November

200 1

elements

des Procedes, France,

of processes

and

systems

mixture.

In

one

the process

comprises

providing

a gas mixture

composed

perfluorocompound pressure);

providing

membrane

having

side;

and

of this

the steps

of:

of at least one

gas and at least one carrier

gas (the gas mixture

being

at a predetermined

at least one glassy polymer a feed side and

contacting

membrane

gas from

embodiment

invention,

to

the

feed

a permeate side

with the gas mixture.

of

this

It also involves

Research Trends for flux recovery

One

common

of

the

most

encountered

in water

membranes

is fouling.

(NOM)

represents

foulant.

Membranes

hydrophilic

Natural

a particularly

problematic

may be fouled by relatively hydrophobic

NOM

depending

on

characteristics,

membrane

properties

for

a

conditions.

To maximize

NOM-fouled (NTR

7410),

chemical

hydraulic

rinsing

with

a relatively

velocity

strategies. surface surfactant

were

investigated

The modification with

either was

NOM and

flux recovery

ultrafiltration

membrane flow

(UF)

cleaning high

and

Each

commercial porous and

phytase

rejection.

fouling

Foulants

evaluated and

from

to

because.of

nudease

The

improved

through

a

filtered,

solubility,

compared

High

performance

gel filuation

profiles indicated that

in the SPC remained

also had reduced

flavour

intact. The SPC

when

original soy flour, according

by

liquid

compared

to the

; permeate

flux by acid and caustic cleanings, from

than

cross-

or a cationic to

minimize

longitudinal channel

direction

sections flow

transitional

mass

has

(sodium

dodecyl

parameters

of

Langmuir

the

; efficiency of caustic cleaning, but not high ionic cleaning. The membrane was ; strength : successfully modified only with the cationic however,

: was accompanied

enhanced

NOM

by a significant

adsorption model

I

flux reduction.

I Adsorotion of dves on activated i carbon and natural zeolite of basic

enhance

NOM

onto

granular

a hydrophobic

NOM

zeolite

has

batch

dyes

from

activated been

data.

adsorber.

The

abruptly

the

in the

kinetic solid

concentration and

combined

investigation.

represented

with external

The mass

for

dependence on

by simple empirical

the

of the

the

initial

adsorbent

can

be

equations.

Vi Meshko,

L. Markovska,

Rodrigues:

Water Research 35(14),

(October

using the diffusion

is proposed

coefficient and

The

Freundlich

homogeneous

resistance

concentration

and

studied.

were determined

An

diffusion

2001

been

(solid diffusion),

M. Mincheva,

A.E.

3357-3366

2001).

Purification

of oily wastewater

Investigations

on

wastewater

using

(UF) and membrane

influence

method UF

polyvinylidene and

treatment

membranes,

have

module,

of

(MD) as a final

been

performed.

equipped (PVDF)

MD module

oily

of ultrafiltration

distillation

fluoride

and a capillary

A with

membranes,

with polypropylene

were tested using typical bilge water

an

that

of

pretreatment).

was

the

by a combination

tubular

aqueous

carbon

studied

dye

isotherms

purification

adsorption

that

reiection

: H. Lee, G. Amy, J. Cho, Y. Yoon, S.-H. Moon, i I.S. Kim: Water Research 35(14), 3301-3308 i (October 2001).

The

zones,

such

C. Lanyi, C. Biddell

initial

mass-transfer

surfactant,

by transitional

changes

adsorbent

time influenced

its

zones.

! cleaning

and longer cleaning

in

of subsequent

Patent number: US 6312591

adsorption

: velocity

with to be

for a concentrated

and arranged

agitation,

was comparatively

such

liquid

includes

separated

NOM

0.1 M NaCl

liquid

surfaces

a number

direction

to the

a respective

in parallel

channel

and is constructed

of the

of sample

an outlet

Each

: sulphate (SDS)) was not effective as a cleaning I agent for foulants from either hydrophobic or i hydrophilic NOM sources. High ionic strength with

a flow

hydrophilic

surfactant

side

construction.

with

Publication date: 6 November

j foulants

An anionic

either

is connected

and with

material

at a side adjacent

Inventors: V. Vassarotti,

to gas chromatography

and sensory evaluation.

a relatively

on

for the flow of sample

solution.

main

of an

over the membranes’

that each channel

in the pectinase was

each

in a sandwich

for feeding

the inlet

pair

each include or micro&ration

is provided

tangentially

the contaminant SPC

arranged

least

filtration

a sheet of support

of the blocks,

channel

at

two

between

cell

filtration

comprises least

The elements

material

membranes,

The

soy isolates that are produced

chromatography

flavour pro&s

using

system.

of the

increased

precipitation.

the proteins

activity

functionality

with conventional acid

diafiltered

the with

had reduced levels of physic acid

acids

and

and

treated

steel ultrafiltration

enzymes.

i solution : natural source were cleaned more effectively in terms of : agitated

membrane

pectinases

stainless

nucleic

Soy

was enzymatically

as cleaning

of the membrane

an anionic

also

flour,

ultrafiltration.

problems

components, operating

support

: effective in providing flux recovery for NOMmembranes compared with other applications of ! fouled : chemical cleaning agents. Increased cross-flow organic matter

treatment

and/or

membranes,

with

flow

two flat ultrafiltration

treatment

j source.

Cleaning strategies of a UF membrane

and (SPC) was

material,

It at

outlet for the filtrate, USA

concentrate

a process

liquid.

arranged

of enzyme

by

tangential

and

blocks.

produced

resulting product

recover at least one perfluorocompound a gas

production

out

blocks

A high quality soy protein

starting

Air Liquide, USA

are given

Sartorius AG, Germany

h+ee:

carrying

combined

Liquide, Societe Anonyme pour

l’Etude et Nxploitation

flow

for

Soy proteins

Separation and recovery of perfluorocompound gases

cell for tangential

Patent number: US 6312502

/I.r@zee: Abbott Laboratories, 2001

2001

The subject of this patent is a filtration

Patent number: US 63 12572 Publication date: 6 November

H. Shallo,

carrier gas.

Inventor:

and American

Filtration filtration

adjacent

S. Katayama

L.I. Ndife,

gas.

least one of the electrodes.

Assignee: IXir

Inventors: R.L. Thomas, L.P. Nelles

comprising

from the permeate

as a permeate

is

predetermined

at least one perfluorocompound

gas mixture,

ion

openings

spacing

membrane

ion

are mounted

on

to maintain

an

It comprises

positions

arrangement

surface

of

details

electrolyzer.

opposed

membrane,

stream),

And also withdrawing

provides

Patent number: US 63 13273

from the feed side of the membrane

(as a nonpermeate

2001

collected

from

The permeate

a harbour obtained

(without from the

Membrane Technology No. 144